It is not like the other axes (X, Y, and Z) that move only when ordered and stop immediately when they have to stop. I won’t go into too much detail here, but the idea behind linear progress is that extrusion is not a linear system. The linear advancement of extrusion is something that is not talked about much. You can print a temperature tower and find the optimal temperature for the filament you use! Linear feed You can find the ideal temperature by following this simple guide: Correct temperatureĮven printing too hot can produce the effect described above and facilitate the dripping of excess material, so make sure that the temperatures are optimized for the material you use. This results in larger and more evident castings outside the press. Therefore, when the nozzle stops for a fraction of a second at the end of a perimeter ring, it extrudes much more material than it would in normal conditions. This actually worsens as an excessive extrusion can cause a build-up of pressure inside the nozzle, making retraction ineffective. Printing with an incorrectly calibrated extruder will make the perimeter seams more visible on the prints. You can check my guide on retraction settings for more information Calibration of the Extruder E-steps The values may vary depending on your extrusion system (Bowden or direct) and may require some tests to find the optimal values. If the speed is too high, the drive gear can abrade the filament or cause the extruder motor to lose steps. Just like the retraction distance, however, it is possible to exaggerate also in this case. On the other hand, it is important not to have this value too high as it can significantly increase the chances of clogging the hot end (if the molten plastic is extracted too far back into the hotend).Ī too slow retraction will not eliminate the pressure exerted by the incoming material and will not have the desired effect. If the retraction distance is not sufficiently high, the plastic will come out of the nozzle when the printer finishes the external perimeter. The important parameters to consider are the retraction distance and the retraction speed. If you haven’t already optimized the retraction settings then it will certainly impact the visibility of the seams in the prints. I will try to describe the settings that are crucial and then move on to some other settings that will be able to help you further. There are several ways you can try to make the perimeter seams less visible. Unfortunately, there is no way to get rid of it completely, only by using the spiral printing mode, which has very restrictive limitations and cannot always be used. Not only in the layer changes but also in the transition from perimeter to the perimeter. And that’s why the seam will start to become evident. We have understood how the creation of a layer works, the thing we will notice now is that even in the transition from perimeter to the perimeter and from perimeter to infill the nozzle takes short breaks expressed in a retraction movement. This is essential along with print speed, in this way it is easy for the infill to maintain the shape. Why are the perimeters printed and then the filling? Simply because the perimeters create the “case” for the filling material, allowing it to adhere to the edges during extrusion. From this, we can see that the change of layer actually takes place at the last printed point of the infill, since this is the last part that is printed on any layer. This can be easily confirmed by previewing any G-code or even just looking at the printer while it works.
0 kommentar(er)
